* = Dimensions are for straight running roads (Center to Center), for siding increase as above. (see 5)
+ = Dimensions are for straight platforms, increase on curves as necessary.

6 = In British N gauge, 9mm gauge track is used. The correct 1/148th scale track gauge works out at 9.7143mm all models are built to suit available 9mm gauge trackwork.The track gauge (W) is measured between the inside faces of the rails, not the rail centers as marked on the above diagrams.

Thanks must go to `Model Rail’ magazine for publishing the BRMSB standard dimensions for `TT3′, `HO’, `OO’, `EM’ and `O fine’ scales in the July 2000 issue which prompted me to add the dimensions for `British N gauge’ and `2mm finescale’. The N gauge dimensions are for British 1/148th scale.